Westerman was arrested when police went to detain his friend and co-rioter Jordan Teal, who was at the same house.
Judge Richardson said the violence carried out by people such as Westerman was so severe, some injured police officers had still not returned to work.
Video was played to the court which showed Westerman jumping around in his grey hoody and shorts.
He was present when a bin was thrown through a window at the hotel, with the prosecution saying he was “front and centre” during the violence.
During the window fitter’s arrest, he told officers he had “no regrets for what he had done”.
The judge said this “vile attitude… reveals your mindset”.
The case was held without Westerman’s friends and family in the court following previous disorder in the public gallery when people were shouting during the hearing.
